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<pre><span class="sourceLineNo">001</span>/* ===========================================================<a name="line.1"></a>
<span class="sourceLineNo">002</span> * JFreeChart : a free chart library for the Java(tm) platform<a name="line.2"></a>
<span class="sourceLineNo">003</span> * ===========================================================<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.<a name="line.5"></a>
<span class="sourceLineNo">006</span> *<a name="line.6"></a>
<span class="sourceLineNo">007</span> * Project Info:  http://www.jfree.org/jfreechart/index.html<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * This library is free software; you can redistribute it and/or modify it<a name="line.9"></a>
<span class="sourceLineNo">010</span> * under the terms of the GNU Lesser General Public License as published by<a name="line.10"></a>
<span class="sourceLineNo">011</span> * the Free Software Foundation; either version 2.1 of the License, or<a name="line.11"></a>
<span class="sourceLineNo">012</span> * (at your option) any later version.<a name="line.12"></a>
<span class="sourceLineNo">013</span> *<a name="line.13"></a>
<span class="sourceLineNo">014</span> * This library is distributed in the hope that it will be useful, but<a name="line.14"></a>
<span class="sourceLineNo">015</span> * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY<a name="line.15"></a>
<span class="sourceLineNo">016</span> * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public<a name="line.16"></a>
<span class="sourceLineNo">017</span> * License for more details.<a name="line.17"></a>
<span class="sourceLineNo">018</span> *<a name="line.18"></a>
<span class="sourceLineNo">019</span> * You should have received a copy of the GNU Lesser General Public<a name="line.19"></a>
<span class="sourceLineNo">020</span> * License along with this library; if not, write to the Free Software<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,<a name="line.21"></a>
<span class="sourceLineNo">022</span> * USA.<a name="line.22"></a>
<span class="sourceLineNo">023</span> *<a name="line.23"></a>
<span class="sourceLineNo">024</span> * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. <a name="line.24"></a>
<span class="sourceLineNo">025</span> * Other names may be trademarks of their respective owners.]<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> * ---------------------<a name="line.27"></a>
<span class="sourceLineNo">028</span> * XYSplineRenderer.java<a name="line.28"></a>
<span class="sourceLineNo">029</span> * ---------------------<a name="line.29"></a>
<span class="sourceLineNo">030</span> * (C) Copyright 2007-2011, by Klaus Rheinwald and Contributors.<a name="line.30"></a>
<span class="sourceLineNo">031</span> *<a name="line.31"></a>
<span class="sourceLineNo">032</span> * Original Author:  Klaus Rheinwald;<a name="line.32"></a>
<span class="sourceLineNo">033</span> * Contributor(s):   Tobias von Petersdorff (tvp@math.umd.edu,<a name="line.33"></a>
<span class="sourceLineNo">034</span> *                       http://www.wam.umd.edu/~petersd/);<a name="line.34"></a>
<span class="sourceLineNo">035</span> *                   David Gilbert (for Object Refinery Limited);<a name="line.35"></a>
<span class="sourceLineNo">036</span> *<a name="line.36"></a>
<span class="sourceLineNo">037</span> * Changes:<a name="line.37"></a>
<span class="sourceLineNo">038</span> * --------<a name="line.38"></a>
<span class="sourceLineNo">039</span> * 25-Jul-2007 : Version 1, contributed by Klaus Rheinwald (DG);<a name="line.39"></a>
<span class="sourceLineNo">040</span> * 03-Aug-2007 : Added new constructor (KR);<a name="line.40"></a>
<span class="sourceLineNo">041</span> * 25-Oct-2007 : Prevent duplicate control points (KR);<a name="line.41"></a>
<span class="sourceLineNo">042</span> * 19-May-2009 : Fixed FindBugs warnings, patch by Michal Wozniak (DG);<a name="line.42"></a>
<span class="sourceLineNo">043</span> *<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>package org.jfree.chart.renderer.xy;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>import java.awt.Graphics2D;<a name="line.48"></a>
<span class="sourceLineNo">049</span>import java.awt.geom.Rectangle2D;<a name="line.49"></a>
<span class="sourceLineNo">050</span>import java.util.Vector;<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span>import org.jfree.chart.axis.ValueAxis;<a name="line.52"></a>
<span class="sourceLineNo">053</span>import org.jfree.chart.event.RendererChangeEvent;<a name="line.53"></a>
<span class="sourceLineNo">054</span>import org.jfree.chart.plot.PlotOrientation;<a name="line.54"></a>
<span class="sourceLineNo">055</span>import org.jfree.chart.plot.PlotRenderingInfo;<a name="line.55"></a>
<span class="sourceLineNo">056</span>import org.jfree.chart.plot.XYPlot;<a name="line.56"></a>
<span class="sourceLineNo">057</span>import org.jfree.data.xy.XYDataset;<a name="line.57"></a>
<span class="sourceLineNo">058</span>import org.jfree.ui.RectangleEdge;<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>/**<a name="line.60"></a>
<span class="sourceLineNo">061</span> * A renderer that connects data points with natural cubic splines and/or<a name="line.61"></a>
<span class="sourceLineNo">062</span> * draws shapes at each data point.  This renderer is designed for use with<a name="line.62"></a>
<span class="sourceLineNo">063</span> * the {@link XYPlot} class. The example shown here is generated by the<a name="line.63"></a>
<span class="sourceLineNo">064</span> * &lt;code&gt;XYSplineRendererDemo1.java&lt;/code&gt; program included in the JFreeChart<a name="line.64"></a>
<span class="sourceLineNo">065</span> * demo collection:<a name="line.65"></a>
<span class="sourceLineNo">066</span> * &lt;br&gt;&lt;br&gt;<a name="line.66"></a>
<span class="sourceLineNo">067</span> * &lt;img src="../../../../../images/XYSplineRendererSample.png"<a name="line.67"></a>
<span class="sourceLineNo">068</span> * alt="XYSplineRendererSample.png" /&gt;<a name="line.68"></a>
<span class="sourceLineNo">069</span> *<a name="line.69"></a>
<span class="sourceLineNo">070</span> * @since 1.0.7<a name="line.70"></a>
<span class="sourceLineNo">071</span> */<a name="line.71"></a>
<span class="sourceLineNo">072</span>public class XYSplineRenderer extends XYLineAndShapeRenderer {<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>    /**<a name="line.74"></a>
<span class="sourceLineNo">075</span>     * To collect data points for later splining.<a name="line.75"></a>
<span class="sourceLineNo">076</span>     */<a name="line.76"></a>
<span class="sourceLineNo">077</span>    private Vector points;<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>    /**<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * Resolution of splines (number of line segments between points)<a name="line.80"></a>
<span class="sourceLineNo">081</span>     */<a name="line.81"></a>
<span class="sourceLineNo">082</span>    private int precision;<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>    /**<a name="line.84"></a>
<span class="sourceLineNo">085</span>     * Creates a new instance with the 'precision' attribute defaulting to<a name="line.85"></a>
<span class="sourceLineNo">086</span>     * 5.<a name="line.86"></a>
<span class="sourceLineNo">087</span>     */<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public XYSplineRenderer() {<a name="line.88"></a>
<span class="sourceLineNo">089</span>        this(5);<a name="line.89"></a>
<span class="sourceLineNo">090</span>    }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span>    /**<a name="line.92"></a>
<span class="sourceLineNo">093</span>     * Creates a new renderer with the specified precision.<a name="line.93"></a>
<span class="sourceLineNo">094</span>     *<a name="line.94"></a>
<span class="sourceLineNo">095</span>     * @param precision  the number of points between data items.<a name="line.95"></a>
<span class="sourceLineNo">096</span>     */<a name="line.96"></a>
<span class="sourceLineNo">097</span>    public XYSplineRenderer(int precision) {<a name="line.97"></a>
<span class="sourceLineNo">098</span>        super();<a name="line.98"></a>
<span class="sourceLineNo">099</span>        if (precision &lt;= 0) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>            throw new IllegalArgumentException("Requires precision &gt; 0.");<a name="line.100"></a>
<span class="sourceLineNo">101</span>        }<a name="line.101"></a>
<span class="sourceLineNo">102</span>        this.precision = precision;<a name="line.102"></a>
<span class="sourceLineNo">103</span>    }<a name="line.103"></a>
<span class="sourceLineNo">104</span><a name="line.104"></a>
<span class="sourceLineNo">105</span>    /**<a name="line.105"></a>
<span class="sourceLineNo">106</span>     * Get the resolution of splines.<a name="line.106"></a>
<span class="sourceLineNo">107</span>     *<a name="line.107"></a>
<span class="sourceLineNo">108</span>     * @return Number of line segments between points.<a name="line.108"></a>
<span class="sourceLineNo">109</span>     *<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * @see #setPrecision(int)<a name="line.110"></a>
<span class="sourceLineNo">111</span>     */<a name="line.111"></a>
<span class="sourceLineNo">112</span>    public int getPrecision() {<a name="line.112"></a>
<span class="sourceLineNo">113</span>        return this.precision;<a name="line.113"></a>
<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>    /**<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * Set the resolution of splines and sends a {@link RendererChangeEvent}<a name="line.117"></a>
<span class="sourceLineNo">118</span>     * to all registered listeners.<a name="line.118"></a>
<span class="sourceLineNo">119</span>     *<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * @param p  number of line segments between points (must be &gt; 0).<a name="line.120"></a>
<span class="sourceLineNo">121</span>     *<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * @see #getPrecision()<a name="line.122"></a>
<span class="sourceLineNo">123</span>     */<a name="line.123"></a>
<span class="sourceLineNo">124</span>    public void setPrecision(int p) {<a name="line.124"></a>
<span class="sourceLineNo">125</span>        if (p &lt;= 0) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>            throw new IllegalArgumentException("Requires p &gt; 0.");<a name="line.126"></a>
<span class="sourceLineNo">127</span>        }<a name="line.127"></a>
<span class="sourceLineNo">128</span>        this.precision = p;<a name="line.128"></a>
<span class="sourceLineNo">129</span>        fireChangeEvent();<a name="line.129"></a>
<span class="sourceLineNo">130</span>    }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span>    /**<a name="line.132"></a>
<span class="sourceLineNo">133</span>     * Initialises the renderer.<a name="line.133"></a>
<span class="sourceLineNo">134</span>     * &lt;P&gt;<a name="line.134"></a>
<span class="sourceLineNo">135</span>     * This method will be called before the first item is rendered, giving the<a name="line.135"></a>
<span class="sourceLineNo">136</span>     * renderer an opportunity to initialise any state information it wants to<a name="line.136"></a>
<span class="sourceLineNo">137</span>     * maintain.  The renderer can do nothing if it chooses.<a name="line.137"></a>
<span class="sourceLineNo">138</span>     *<a name="line.138"></a>
<span class="sourceLineNo">139</span>     * @param g2  the graphics device.<a name="line.139"></a>
<span class="sourceLineNo">140</span>     * @param dataArea  the area inside the axes.<a name="line.140"></a>
<span class="sourceLineNo">141</span>     * @param plot  the plot.<a name="line.141"></a>
<span class="sourceLineNo">142</span>     * @param data  the data.<a name="line.142"></a>
<span class="sourceLineNo">143</span>     * @param info  an optional info collection object to return data back to<a name="line.143"></a>
<span class="sourceLineNo">144</span>     *              the caller.<a name="line.144"></a>
<span class="sourceLineNo">145</span>     *<a name="line.145"></a>
<span class="sourceLineNo">146</span>     * @return The renderer state.<a name="line.146"></a>
<span class="sourceLineNo">147</span>     */<a name="line.147"></a>
<span class="sourceLineNo">148</span>    public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,<a name="line.148"></a>
<span class="sourceLineNo">149</span>            XYPlot plot, XYDataset data, PlotRenderingInfo info) {<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>        State state = (State) super.initialise(g2, dataArea, plot, data, info);<a name="line.151"></a>
<span class="sourceLineNo">152</span>        state.setProcessVisibleItemsOnly(false);<a name="line.152"></a>
<span class="sourceLineNo">153</span>        this.points = new Vector();<a name="line.153"></a>
<span class="sourceLineNo">154</span>        setDrawSeriesLineAsPath(true);<a name="line.154"></a>
<span class="sourceLineNo">155</span>        return state;<a name="line.155"></a>
<span class="sourceLineNo">156</span>    }<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span>    /**<a name="line.158"></a>
<span class="sourceLineNo">159</span>     * Draws the item (first pass). This method draws the lines<a name="line.159"></a>
<span class="sourceLineNo">160</span>     * connecting the items. Instead of drawing separate lines,<a name="line.160"></a>
<span class="sourceLineNo">161</span>     * a GeneralPath is constructed and drawn at the end of<a name="line.161"></a>
<span class="sourceLineNo">162</span>     * the series painting.<a name="line.162"></a>
<span class="sourceLineNo">163</span>     *<a name="line.163"></a>
<span class="sourceLineNo">164</span>     * @param g2  the graphics device.<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * @param state  the renderer state.<a name="line.165"></a>
<span class="sourceLineNo">166</span>     * @param plot  the plot (can be used to obtain standard color information<a name="line.166"></a>
<span class="sourceLineNo">167</span>     *              etc).<a name="line.167"></a>
<span class="sourceLineNo">168</span>     * @param dataset  the dataset.<a name="line.168"></a>
<span class="sourceLineNo">169</span>     * @param pass  the pass.<a name="line.169"></a>
<span class="sourceLineNo">170</span>     * @param series  the series index (zero-based).<a name="line.170"></a>
<span class="sourceLineNo">171</span>     * @param item  the item index (zero-based).<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * @param domainAxis  the domain axis.<a name="line.172"></a>
<span class="sourceLineNo">173</span>     * @param rangeAxis  the range axis.<a name="line.173"></a>
<span class="sourceLineNo">174</span>     * @param dataArea  the area within which the data is being drawn.<a name="line.174"></a>
<span class="sourceLineNo">175</span>     */<a name="line.175"></a>
<span class="sourceLineNo">176</span>    protected void drawPrimaryLineAsPath(XYItemRendererState state,<a name="line.176"></a>
<span class="sourceLineNo">177</span>            Graphics2D g2, XYPlot plot, XYDataset dataset, int pass,<a name="line.177"></a>
<span class="sourceLineNo">178</span>            int series, int item, ValueAxis domainAxis, ValueAxis rangeAxis,<a name="line.178"></a>
<span class="sourceLineNo">179</span>            Rectangle2D dataArea) {<a name="line.179"></a>
<span class="sourceLineNo">180</span><a name="line.180"></a>
<span class="sourceLineNo">181</span>        RectangleEdge xAxisLocation = plot.getDomainAxisEdge();<a name="line.181"></a>
<span class="sourceLineNo">182</span>        RectangleEdge yAxisLocation = plot.getRangeAxisEdge();<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span>        // get the data points<a name="line.184"></a>
<span class="sourceLineNo">185</span>        double x1 = dataset.getXValue(series, item);<a name="line.185"></a>
<span class="sourceLineNo">186</span>        double y1 = dataset.getYValue(series, item);<a name="line.186"></a>
<span class="sourceLineNo">187</span>        double transX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);<a name="line.187"></a>
<span class="sourceLineNo">188</span>        double transY1 = rangeAxis.valueToJava2D(y1, dataArea, yAxisLocation);<a name="line.188"></a>
<span class="sourceLineNo">189</span><a name="line.189"></a>
<span class="sourceLineNo">190</span>        // collect points<a name="line.190"></a>
<span class="sourceLineNo">191</span>        if (!Double.isNaN(transX1) &amp;&amp; !Double.isNaN(transY1)) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>            ControlPoint p = new ControlPoint(plot.getOrientation()<a name="line.192"></a>
<span class="sourceLineNo">193</span>                                == PlotOrientation.HORIZONTAL ? (float) transY1<a name="line.193"></a>
<span class="sourceLineNo">194</span>                                : (float) transX1, plot.getOrientation()<a name="line.194"></a>
<span class="sourceLineNo">195</span>                                == PlotOrientation.HORIZONTAL ? (float) transX1<a name="line.195"></a>
<span class="sourceLineNo">196</span>                                        : (float) transY1);<a name="line.196"></a>
<span class="sourceLineNo">197</span>            if (!this.points.contains(p)) {<a name="line.197"></a>
<span class="sourceLineNo">198</span>                this.points.add(p);<a name="line.198"></a>
<span class="sourceLineNo">199</span>            }<a name="line.199"></a>
<span class="sourceLineNo">200</span>        }<a name="line.200"></a>
<span class="sourceLineNo">201</span>        if (item == dataset.getItemCount(series) - 1) {<a name="line.201"></a>
<span class="sourceLineNo">202</span>            State s = (State) state;<a name="line.202"></a>
<span class="sourceLineNo">203</span>            // construct path<a name="line.203"></a>
<span class="sourceLineNo">204</span>            if (this.points.size() &gt; 1) {<a name="line.204"></a>
<span class="sourceLineNo">205</span>                // we need at least two points to draw something<a name="line.205"></a>
<span class="sourceLineNo">206</span>                ControlPoint cp0 = (ControlPoint) this.points.get(0);<a name="line.206"></a>
<span class="sourceLineNo">207</span>                s.seriesPath.moveTo(cp0.x, cp0.y);<a name="line.207"></a>
<span class="sourceLineNo">208</span>                if (this.points.size() == 2) {<a name="line.208"></a>
<span class="sourceLineNo">209</span>                    // we need at least 3 points to spline. Draw simple line<a name="line.209"></a>
<span class="sourceLineNo">210</span>                    // for two points<a name="line.210"></a>
<span class="sourceLineNo">211</span>                    ControlPoint cp1 = (ControlPoint) this.points.get(1);<a name="line.211"></a>
<span class="sourceLineNo">212</span>                    s.seriesPath.lineTo(cp1.x, cp1.y);<a name="line.212"></a>
<span class="sourceLineNo">213</span>                }<a name="line.213"></a>
<span class="sourceLineNo">214</span>                else {<a name="line.214"></a>
<span class="sourceLineNo">215</span>                    // construct spline<a name="line.215"></a>
<span class="sourceLineNo">216</span>                    int np = this.points.size(); // number of points<a name="line.216"></a>
<span class="sourceLineNo">217</span>                    float[] d = new float[np]; // Newton form coefficients<a name="line.217"></a>
<span class="sourceLineNo">218</span>                    float[] x = new float[np]; // x-coordinates of nodes<a name="line.218"></a>
<span class="sourceLineNo">219</span>                    float y;<a name="line.219"></a>
<span class="sourceLineNo">220</span>                    float t;<a name="line.220"></a>
<span class="sourceLineNo">221</span>                    float oldy = 0;<a name="line.221"></a>
<span class="sourceLineNo">222</span>                    float oldt = 0;<a name="line.222"></a>
<span class="sourceLineNo">223</span><a name="line.223"></a>
<span class="sourceLineNo">224</span>                    float[] a = new float[np];<a name="line.224"></a>
<span class="sourceLineNo">225</span>                    float t1;<a name="line.225"></a>
<span class="sourceLineNo">226</span>                    float t2;<a name="line.226"></a>
<span class="sourceLineNo">227</span>                    float[] h = new float[np];<a name="line.227"></a>
<span class="sourceLineNo">228</span><a name="line.228"></a>
<span class="sourceLineNo">229</span>                    for (int i = 0; i &lt; np; i++) {<a name="line.229"></a>
<span class="sourceLineNo">230</span>                        ControlPoint cpi = (ControlPoint) this.points.get(i);<a name="line.230"></a>
<span class="sourceLineNo">231</span>                        x[i] = cpi.x;<a name="line.231"></a>
<span class="sourceLineNo">232</span>                        d[i] = cpi.y;<a name="line.232"></a>
<span class="sourceLineNo">233</span>                    }<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>                    for (int i = 1; i &lt;= np - 1; i++) {<a name="line.235"></a>
<span class="sourceLineNo">236</span>                        h[i] = x[i] - x[i - 1];<a name="line.236"></a>
<span class="sourceLineNo">237</span>                    }<a name="line.237"></a>
<span class="sourceLineNo">238</span>                    float[] sub = new float[np - 1];<a name="line.238"></a>
<span class="sourceLineNo">239</span>                    float[] diag = new float[np - 1];<a name="line.239"></a>
<span class="sourceLineNo">240</span>                    float[] sup = new float[np - 1];<a name="line.240"></a>
<span class="sourceLineNo">241</span><a name="line.241"></a>
<span class="sourceLineNo">242</span>                    for (int i = 1; i &lt;= np - 2; i++) {<a name="line.242"></a>
<span class="sourceLineNo">243</span>                        diag[i] = (h[i] + h[i + 1]) / 3;<a name="line.243"></a>
<span class="sourceLineNo">244</span>                        sup[i] = h[i + 1] / 6;<a name="line.244"></a>
<span class="sourceLineNo">245</span>                        sub[i] = h[i] / 6;<a name="line.245"></a>
<span class="sourceLineNo">246</span>                        a[i] = (d[i + 1] - d[i]) / h[i + 1]<a name="line.246"></a>
<span class="sourceLineNo">247</span>                                   - (d[i] - d[i - 1]) / h[i];<a name="line.247"></a>
<span class="sourceLineNo">248</span>                    }<a name="line.248"></a>
<span class="sourceLineNo">249</span>                    solveTridiag(sub, diag, sup, a, np - 2);<a name="line.249"></a>
<span class="sourceLineNo">250</span><a name="line.250"></a>
<span class="sourceLineNo">251</span>                    // note that a[0]=a[np-1]=0<a name="line.251"></a>
<span class="sourceLineNo">252</span>                    // draw<a name="line.252"></a>
<span class="sourceLineNo">253</span>                    oldt = x[0];<a name="line.253"></a>
<span class="sourceLineNo">254</span>                    oldy = d[0];<a name="line.254"></a>
<span class="sourceLineNo">255</span>                    s.seriesPath.moveTo(oldt, oldy);<a name="line.255"></a>
<span class="sourceLineNo">256</span>                    for (int i = 1; i &lt;= np - 1; i++) {<a name="line.256"></a>
<span class="sourceLineNo">257</span>                        // loop over intervals between nodes<a name="line.257"></a>
<span class="sourceLineNo">258</span>                        for (int j = 1; j &lt;= this.precision; j++) {<a name="line.258"></a>
<span class="sourceLineNo">259</span>                            t1 = (h[i] * j) / this.precision;<a name="line.259"></a>
<span class="sourceLineNo">260</span>                            t2 = h[i] - t1;<a name="line.260"></a>
<span class="sourceLineNo">261</span>                            y = ((-a[i - 1] / 6 * (t2 + h[i]) * t1 + d[i - 1])<a name="line.261"></a>
<span class="sourceLineNo">262</span>                                    * t2 + (-a[i] / 6 * (t1 + h[i]) * t2<a name="line.262"></a>
<span class="sourceLineNo">263</span>                                    + d[i]) * t1) / h[i];<a name="line.263"></a>
<span class="sourceLineNo">264</span>                            t = x[i - 1] + t1;<a name="line.264"></a>
<span class="sourceLineNo">265</span>                            s.seriesPath.lineTo(t, y);<a name="line.265"></a>
<span class="sourceLineNo">266</span>                        }<a name="line.266"></a>
<span class="sourceLineNo">267</span>                    }<a name="line.267"></a>
<span class="sourceLineNo">268</span>                }<a name="line.268"></a>
<span class="sourceLineNo">269</span>                // draw path<a name="line.269"></a>
<span class="sourceLineNo">270</span>                drawFirstPassShape(g2, pass, series, item, s.seriesPath);<a name="line.270"></a>
<span class="sourceLineNo">271</span>            }<a name="line.271"></a>
<span class="sourceLineNo">272</span><a name="line.272"></a>
<span class="sourceLineNo">273</span>            // reset points vector<a name="line.273"></a>
<span class="sourceLineNo">274</span>            this.points = new Vector();<a name="line.274"></a>
<span class="sourceLineNo">275</span>        }<a name="line.275"></a>
<span class="sourceLineNo">276</span>    }<a name="line.276"></a>
<span class="sourceLineNo">277</span><a name="line.277"></a>
<span class="sourceLineNo">278</span>    private void solveTridiag(float[] sub, float[] diag, float[] sup,<a name="line.278"></a>
<span class="sourceLineNo">279</span>            float[] b, int n) {<a name="line.279"></a>
<span class="sourceLineNo">280</span>/*      solve linear system with tridiagonal n by n matrix a<a name="line.280"></a>
<span class="sourceLineNo">281</span>        using Gaussian elimination *without* pivoting<a name="line.281"></a>
<span class="sourceLineNo">282</span>        where   a(i,i-1) = sub[i]  for 2&lt;=i&lt;=n<a name="line.282"></a>
<span class="sourceLineNo">283</span>        a(i,i)   = diag[i] for 1&lt;=i&lt;=n<a name="line.283"></a>
<span class="sourceLineNo">284</span>        a(i,i+1) = sup[i]  for 1&lt;=i&lt;=n-1<a name="line.284"></a>
<span class="sourceLineNo">285</span>        (the values sub[1], sup[n] are ignored)<a name="line.285"></a>
<span class="sourceLineNo">286</span>        right hand side vector b[1:n] is overwritten with solution<a name="line.286"></a>
<span class="sourceLineNo">287</span>        NOTE: 1...n is used in all arrays, 0 is unused */<a name="line.287"></a>
<span class="sourceLineNo">288</span>        int i;<a name="line.288"></a>
<span class="sourceLineNo">289</span>/*                  factorization and forward substitution */<a name="line.289"></a>
<span class="sourceLineNo">290</span>        for (i = 2; i &lt;= n; i++) {<a name="line.290"></a>
<span class="sourceLineNo">291</span>            sub[i] = sub[i] / diag[i - 1];<a name="line.291"></a>
<span class="sourceLineNo">292</span>            diag[i] = diag[i] - sub[i] * sup[i - 1];<a name="line.292"></a>
<span class="sourceLineNo">293</span>            b[i] = b[i] - sub[i] * b[i - 1];<a name="line.293"></a>
<span class="sourceLineNo">294</span>        }<a name="line.294"></a>
<span class="sourceLineNo">295</span>        b[n] = b[n] / diag[n];<a name="line.295"></a>
<span class="sourceLineNo">296</span>        for (i = n - 1; i &gt;= 1; i--) {<a name="line.296"></a>
<span class="sourceLineNo">297</span>            b[i] = (b[i] - sup[i] * b[i + 1]) / diag[i];<a name="line.297"></a>
<span class="sourceLineNo">298</span>        }<a name="line.298"></a>
<span class="sourceLineNo">299</span>    }<a name="line.299"></a>
<span class="sourceLineNo">300</span><a name="line.300"></a>
<span class="sourceLineNo">301</span>    /**<a name="line.301"></a>
<span class="sourceLineNo">302</span>     * Tests this renderer for equality with an arbitrary object.<a name="line.302"></a>
<span class="sourceLineNo">303</span>     *<a name="line.303"></a>
<span class="sourceLineNo">304</span>     * @param obj  the object (&lt;code&gt;null&lt;/code&gt; permitted).<a name="line.304"></a>
<span class="sourceLineNo">305</span>     *<a name="line.305"></a>
<span class="sourceLineNo">306</span>     * @return A boolean.<a name="line.306"></a>
<span class="sourceLineNo">307</span>     */<a name="line.307"></a>
<span class="sourceLineNo">308</span>    public boolean equals(Object obj) {<a name="line.308"></a>
<span class="sourceLineNo">309</span>        if (obj == this) {<a name="line.309"></a>
<span class="sourceLineNo">310</span>            return true;<a name="line.310"></a>
<span class="sourceLineNo">311</span>        }<a name="line.311"></a>
<span class="sourceLineNo">312</span>        if (!(obj instanceof XYSplineRenderer)) {<a name="line.312"></a>
<span class="sourceLineNo">313</span>            return false;<a name="line.313"></a>
<span class="sourceLineNo">314</span>        }<a name="line.314"></a>
<span class="sourceLineNo">315</span>        XYSplineRenderer that = (XYSplineRenderer) obj;<a name="line.315"></a>
<span class="sourceLineNo">316</span>        if (this.precision != that.precision) {<a name="line.316"></a>
<span class="sourceLineNo">317</span>            return false;<a name="line.317"></a>
<span class="sourceLineNo">318</span>        }<a name="line.318"></a>
<span class="sourceLineNo">319</span>        return super.equals(obj);<a name="line.319"></a>
<span class="sourceLineNo">320</span>    }<a name="line.320"></a>
<span class="sourceLineNo">321</span><a name="line.321"></a>
<span class="sourceLineNo">322</span>    /**<a name="line.322"></a>
<span class="sourceLineNo">323</span>     * Represents a control point.<a name="line.323"></a>
<span class="sourceLineNo">324</span>     */<a name="line.324"></a>
<span class="sourceLineNo">325</span>    class ControlPoint {<a name="line.325"></a>
<span class="sourceLineNo">326</span><a name="line.326"></a>
<span class="sourceLineNo">327</span>        /** The x-coordinate. */<a name="line.327"></a>
<span class="sourceLineNo">328</span>        public float x;<a name="line.328"></a>
<span class="sourceLineNo">329</span><a name="line.329"></a>
<span class="sourceLineNo">330</span>        /** The y-coordinate. */<a name="line.330"></a>
<span class="sourceLineNo">331</span>        public float y;<a name="line.331"></a>
<span class="sourceLineNo">332</span><a name="line.332"></a>
<span class="sourceLineNo">333</span>        /**<a name="line.333"></a>
<span class="sourceLineNo">334</span>         * Creates a new control point.<a name="line.334"></a>
<span class="sourceLineNo">335</span>         *<a name="line.335"></a>
<span class="sourceLineNo">336</span>         * @param x  the x-coordinate.<a name="line.336"></a>
<span class="sourceLineNo">337</span>         * @param y  the y-coordinate.<a name="line.337"></a>
<span class="sourceLineNo">338</span>         */<a name="line.338"></a>
<span class="sourceLineNo">339</span>        public ControlPoint(float x, float y) {<a name="line.339"></a>
<span class="sourceLineNo">340</span>            this.x = x;<a name="line.340"></a>
<span class="sourceLineNo">341</span>            this.y = y;<a name="line.341"></a>
<span class="sourceLineNo">342</span>        }<a name="line.342"></a>
<span class="sourceLineNo">343</span><a name="line.343"></a>
<span class="sourceLineNo">344</span>        /**<a name="line.344"></a>
<span class="sourceLineNo">345</span>         * Tests this point for equality with an arbitrary object.<a name="line.345"></a>
<span class="sourceLineNo">346</span>         *<a name="line.346"></a>
<span class="sourceLineNo">347</span>         * @param obj  the object (&lt;code&gt;null&lt;/code&gt; permitted.<a name="line.347"></a>
<span class="sourceLineNo">348</span>         *<a name="line.348"></a>
<span class="sourceLineNo">349</span>         * @return A boolean.<a name="line.349"></a>
<span class="sourceLineNo">350</span>         */<a name="line.350"></a>
<span class="sourceLineNo">351</span>        public boolean equals(Object obj) {<a name="line.351"></a>
<span class="sourceLineNo">352</span>            if (obj == this) {<a name="line.352"></a>
<span class="sourceLineNo">353</span>                return true;<a name="line.353"></a>
<span class="sourceLineNo">354</span>            }<a name="line.354"></a>
<span class="sourceLineNo">355</span>            if (!(obj instanceof ControlPoint)) {<a name="line.355"></a>
<span class="sourceLineNo">356</span>                return false;<a name="line.356"></a>
<span class="sourceLineNo">357</span>            }<a name="line.357"></a>
<span class="sourceLineNo">358</span>            ControlPoint that = (ControlPoint) obj;<a name="line.358"></a>
<span class="sourceLineNo">359</span>            if (this.x != that.x) {<a name="line.359"></a>
<span class="sourceLineNo">360</span>                return false;<a name="line.360"></a>
<span class="sourceLineNo">361</span>            }<a name="line.361"></a>
<span class="sourceLineNo">362</span>            /*&amp;&amp; y == ((ControlPoint) obj).y;*/<a name="line.362"></a>
<span class="sourceLineNo">363</span>            return true;<a name="line.363"></a>
<span class="sourceLineNo">364</span>        }<a name="line.364"></a>
<span class="sourceLineNo">365</span><a name="line.365"></a>
<span class="sourceLineNo">366</span>    }<a name="line.366"></a>
<span class="sourceLineNo">367</span>}<a name="line.367"></a>




























































</pre>
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